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Coordination geometries and cooperative ordering effects in copper(II) complexes with tridentate Schiff base dianions. I. Crystal and molecular structure and EPR investigation of N‐salicylideneglycinato‐2‐methylimidazole‐copper(II)
Author(s) -
Sivý J.,
Kettmann V.,
KrätsmárSmogrovič J.,
Svajlenová O.,
Friebel C.,
Plesch G.
Publication year - 1990
Publication title -
zeitschrift für anorganische und allgemeine chemie
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.354
H-Index - 66
eISSN - 1521-3749
pISSN - 0044-2313
DOI - 10.1002/zaac.19905830108
Subject(s) - crystallography , monoclinic crystal system , orthorhombic crystal system , copper , electron paramagnetic resonance , crystal structure , square pyramid , schiff base , chemistry , molecule , zigzag , coordination sphere , nuclear magnetic resonance , geometry , physics , mathematics , organic chemistry
N‐Salicyclideneglycinato(2‐methylimidazole)copper (II) — [Cu(salgly)(2‐MeIm)] — C 13 H 13 N 3 O 3 Cu — crystallizes in the monoclinic space group P2 1 /c, a = 1 248.4, b = 1 157.3, c = 964.5 pm, β = 108.91°, Z = 4; structure determination with 1 504 significant reflections, R = 0.058. The molecular stucture of the complex is characterized by an approximately square coordination of Cu II with O, N, O atoms of the tridendate dianion salgly 2⊖ and the 3‐N atom of 2‐MeIm. The coordination polyhedron is completed to square pyramid by an apically coordinated carboxyl oxygen atom (bond distance 248 pm) from the neighboring complex molecule, thus forming zigzag chains oriented on parallel lines in the crystal structure. The EPR parameters of the title compound (g 1 c= 2.176, g 2 c= 2.146, g 3 c= 2.056) confirm the slightly disturbed antiferrodistortive ordering of the complex molecules quantitatively. From the cooperative g c tensor of a single crystal and the structural data orthorhombic molecular g components were evaluated. They were refined, in order to achieve a still better agreement with the EPR parameters of a series of comparable copper(II) complexes.